Done. Flashed it on my new device last night from a Linux Mint machine and everything went super smoothly - quite surprising considering I'd had a few drinks and wasn't quite firing on all cylinders. Calyx is a sweet OS. I was going to leave the install until I was more sober but just switching on my new phone with the default Google Android booting up boiled my piss so much I had to get the offending item removed as quickly as possible. To clarify, my last phone was still running Google but I'd tweaked it so much over the years that I'd forgotten how intrusive it used to be. I'd go as far as to say that flashing the device with CalyxOS was considerably quicker than just simply booting up the phone for the first time. Really straightforward, no issues, just followed the instructions exactly. One last thing to do to eradicate Google from my life entirely: delete my Gmail account.